👉 Knuckles are a type of nail or cuticle that is often associated with the male genitalia. They are typically found on the outer surface of the skin, especially between the first and second metacarpophalanges (the two middle fingers). Knuckles are also known as "glove nails" due to their appearance resembling knuckles. These nails serve several purposes in males, including aiding in hygiene, providing a decorative aspect, and acting as an important part of the male anatomy.